How To Insulate Duct Work In Attic

Cover the spray foam with fire retardant spray.

How to insulate duct work in attic.

The attic ductwork is flex duct work. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. I called out the original hvac company and they took a look and said they saw no water. Make sure the foil surface of the insulation is free of dust before applying the tape.

Energy saver dealers 204 202 views. Use metal flex or fiber board ducts that are insulated to code. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Tape any punctures in the insulation s vapor barrier to prevent leaks.

Cover the metal ductwork with closed cell spray foam. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. It was new when the ac was put in 7 years ago. Inspect the span of ductwork to be insulated.

Avoid compressing the insulation. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Check the speed of the blower motor on the furnace. The foam provides a vapor barrier so the ductwork won t sweat.

Most insulation relies upon the air space between its fibers to deliver the r value promised. Sure up leaky duct joints. Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water. Mechanically fasten and mastic seal all duct connections.

How to insulate your central air heating ducts 1. When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm. Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket. Look for signs of air leaks at seams or joints such as streams of dust.

How to insulate the attic air sealing the attic energy saving attic insulation duration. If necessary switch the wires to reduce the blower to its lowest. Insulation itself keeps warm air in and prevents cold air from infiltrating. The duct work is the backbone of air exchange and ventilation.

Use a pressure sensitive vapor retarder tape designed for ductwork. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Use a paintbrush to apply duct mastic to the joints where an elbow.